US20160108846A1 - Method and device for operation of a high pressure fuel pump - Google Patents
Method and device for operation of a high pressure fuel pump Download PDFInfo
- Publication number
- US20160108846A1 US20160108846A1 US14/892,074 US201414892074A US2016108846A1 US 20160108846 A1 US20160108846 A1 US 20160108846A1 US 201414892074 A US201414892074 A US 201414892074A US 2016108846 A1 US2016108846 A1 US 2016108846A1
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- pressure
- pump
- fuel
- accumulator tank
- high pressure
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- 239000000446 fuel Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000002485 combustion reaction Methods 0.000 claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000011161 development Methods 0.000 claims abstract description 6
- 238000004590 computer program Methods 0.000 claims description 11
- 238000013500 data storage Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- 230000006870 function Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
- F02M63/0265—Pumps feeding common rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
- F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/025—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by a single piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/225—Leakage detection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
- F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
- F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
Definitions
- the present invention pertains to a method for function control of a high pressure pump in a system for fuel injection in a combustion engine.
- the system comprises an independent feeding pump, controllable by the combustion engine, for the supply of fuel in a low pressure part of the system to the high pressure pump.
- the latter comprises at least one pump element connected between the low pressure part and an accumulator tank for fuel injection to the combustion engine.
- the pump element has a cylinder with a pump chamber with a movable piston inside the chamber for purposes of pumping. In the connecting opening in this cylinder, there is an inlet valve to the low pressure part.
- the inlet valve is controllable for controlling the flow of fuel into the pump chamber.
- the invention also pertains to a device that performs the method.
- the invention is not limited to any specific type of combustion engine or fuel, and diesel and ethanol may be mentioned as a couple of nonexhaustive examples of fuel. Also, the invention pertains to function control of a high pressure pump for supply of fuel to combustion engines that are designed for all types of use, such as in industrial applications, crushing machines and in various types of motor vehicles. The invention is particularly applicable to wheeled motor vehicles, especially commercial vehicles, such as trucks and buses, and will for this reason sometimes be discussed in this application with the objective of elucidating, but not limiting, the invention.
- the invention is applicable to systems in which the feeding pump is controllable independently of the combustion engine. This is advantageously achieved since the pump is driven by an electric engine, which may be controlled totally independently of the combustion engine's function.
- the low pressure part of the system may have any appearance.
- limited performance ability of the high pressure pump may be due to the occurrence of a leak in one or several of the pump elements between the inlet valve and the pump chamber's connecting opening to the low pressure part, e.g. because of a somewhat damaged valve, or leakage between the piston and pump chamber wall because of wear particles getting caught in the fuel and damaging the wall.
- U.S. Pat. No. 7,431,018 describes a method for detecting faults in a high pressure pump by measuring the fuel pressure in the area of the accumulator tank and comparing this with reference values. This is done with the help of a pressure regulator and pressure fault sensor, and the method described therein consists of a relatively blunt instrument for function control of a high pressure pump, and is more focused on discovering larger faults in the function of the same.
- the objective of the present invention is to provide a method and a device of the type defined above, which are improved in at least some respect in relation to prior art methods and devices of this type, with respect to achieving a reliable function control of a said high pressure pump.
- the invention is thus based on the insight that in stationary operating conditions of the combustion engine, with a constantly requested reference value of the fuel pressure in the accumulator tank, the feeding pump may be controlled so that the fuel pressure in the low pressure part at the inlet to the high pressure pump is reduced.
- the pressure in the accumulator tank is measured and compared to the requested reference value of the fuel pressure in the accumulator tank, in order to use the outcome of this comparison as an indication of the high pressure pump's functionality. It has been found that with such a method, the occurrence of both the above mentioned types of leakage, i.e. at the inlet valve and between the piston and the pump chamber wall, in the high pressure pump may be discovered.
- the function control only requires stationary operating conditions in the combustion engine for a brief period of time, in the range of one second, in order to be carried out.
- the method may for example be carried out with desired intervals, when the vehicle is driven on a substantially horizontal base at a substantially constant speed.
- the reduction of the fuel pressure at said position in the low pressure part is carried out toward a predetermined minimum pressure, at which the high pressure pump at normal functioning is incapable of delivering a fuel pressure in the accumulator tank which achieves the requested reference value, and the fuel pressure at the position in the low pressure part, at which the fuel pressure in the accumulator tank falls below the reference value, is registered as a limit pressure.
- the pressure reduction in step b) is made down to a pressure which is higher than or equal to the minimum pressure, and the fuel pressure in the low pressure part at which the comparison in step d) gives a measurable difference, is registered as the limit pressure and used to determine the pump's functionality. If, by carrying out this method, a limit pressure which is higher than the minimum pressure is confirmed, then the conclusion may be drawn that the high pressure pump functions inadequately in its compression phase, because of the occurrence of a leakage between the piston and the pump chamber wall in one or several pump elements.
- the pressure reduction is interrupted in the position, when the fuel pressure in the accumulator tank falls below the requested reference value by a predetermined difference value.
- This difference value may for example be 25-100 bar, 30-70 bar or around 50 bar, and when this occurs, the then prevailing pressure at the position may be determined as the limit pressure.
- step b) the feeding pump is controlled, so that the fuel pressure at the position falls until it is below a minimum pressure by at least 5%, 5-20% or 5-10% when the high pressure pump is unable, during normal functioning, to deliver a fuel pressure in the accumulator tank in accordance with the requested reference value.
- the pressure in the position of the low pressure part down toward the minimum pressure may be detected, but the limit value is not reached until the minimum pressure has been reached, or if it has not been reached, the pressure may be reduced a little to determine whether the high pressure pump has optimal functionality (the pressure in the accumulator tank should then fall) or whether one of the inlet valves is damaged (the pressure in the accumulator tank in that case does not fall).
- the method for a high pressure pump is carried out with several of the pump elements connected in parallel between the low pressure part of the system and the accumulator tank, and in the stationary operating mode of the combustion engine, at which a single pump element is capable of delivering a fuel pressure in the accumulator tank according to the requested reference value alone, and steps a)-d) are carried out during the control of the high pressure pump's elements, so that the single pump element delivers the fuel pressure requested in the accumulator tank in order to determine the functionality of such pump element.
- the steps a)-d) are carried out at intervals for all the pump elements during the control of the high pressure pump's pump elements, so that a single one of the high pressure pump's pump elements delivers a fuel pressure in the accumulator tank alone, according to the requested reference value for the determination of the functionality of all the pump elements.
- This embodiment thus facilitates the identification of a failing pump element, or a pump element with poorer functionality than normal.
- the method comprises storage of data produced during the performance of the method steps, in order to provide the possibility of later assessment of the functionality of the high pressure pump or the high pressure pump and its pump elements.
- the parts of the latter which so require it may be appropriately addressed.
- the invention also provides a device according to the invention equipped with the features disclosed herein.
- FIG. 1 is a schematic view illustrating the structure of a system for fuel supply to a combustion engine, comprising a device according an embodiment of the invention for the performance of a method according to the invention,
- FIG. 2 is a simplified view, illustrating the structure and function of a pump element in a high pressure pump in a system according to FIG. 1 ,
- FIG. 4 are diagrams showing the pressure in the accumulator tank, and in the position in the low pressure part over time, at the performance of the method according to the invention according to two different embodiments,
- FIG. 5 is a flow chart showing a method according to one embodiment of the invention.
- FIG. 6 is a diagram of an electronic control device for the implementation of a method according to the invention.
- FIG. 1 shows a system for fuel injection in a combustion engine equipped with a device according to the invention, and on which methods according to the invention described below are applicable.
- the general structure of the system is prior art and comprises a fuel tank 1 , which is here divided into two containers, from which fuel, via a feeding pump 2 in a low pressure part 3 with a pressure of for example 2-6 bar, is fed to a high pressure part 4 of the system, which starts with a high pressure pump 5 , which pumps fuel at a high pressure, for example in the range of 500-2 500 bar, pumps fuel to an accumulator tank 6 with nozzles 7 for injection of fuel into the cylinders of the combustion engine 8 , which is here arranged in a motor vehicle identified with the digit 9 .
- the components which are drawn inside the frame M are here arranged on the combustion engine.
- the feeding pump 2 is operated by an electric engine 10 , which is controlled by a control device 11 and is thus controllable independently of the combustion engine.
- the high pressure pump comprises one or several pump elements, usually 2-3 pump elements, but the number is arbitrary and may be for example 8, and the pump elements are connected in parallel between the low pressure part 3 of the system and the accumulator tank 6 for fuel injection to the combustion engine.
- FIG. 2 The high pressure pump comprises one or several pump elements, usually 2-3 pump elements, but the number is arbitrary and may be for example 8, and the pump elements are connected in parallel between the low pressure part 3 of the system and the accumulator tank 6 for fuel injection to the combustion engine.
- FIG. 2 shows only one of these pump elements 12 , but they all have the same design and are controlled in the same manner, and in the event there are several such elements, they each have a cylinder 13 with a pump chamber 14 , with a moveable piston 15 for pumping therein, and an inlet valve 17 in the cylinder's connecting opening 16 to the low pressure part, which valve is controllable via an actuator 18 in order to control the flow of fuel into and/or out of the pump chamber 14 .
- the pumping of fuel is effected via a pump element 12 , through a lifter 19 connected with the piston 15 being impacted by a camshaft 20 , which is mechanically connected to the combustion engine's crankshaft 21 , so that the piston 15 will move forwards and backwards in the pump chamber 14 in accordance with the rotation of the engine crankshaft 21 .
- the actuator 18 of the inlet valve 17 is controlled through control signals from a motor control device 22 , which in its turn obtains information regarding the engine crankshaft's or the camshaft's instantaneous position, and thus the position of the piston 15 , via the engine position sensors 23 .
- the engine control device 22 also obtains information from an element 24 designed to measure the fuel pressure in the accumulator tank 6 .
- the actuator 18 controls the inlet valve 17 so that it moves in the same direction, so that fuel may pass through the valve 17 in the connecting opening 16 and be sucked into the pump chamber 14 .
- the actuator 18 controls the inlet valve 17 , so that it moves upwards to abut against the walls defined in the connecting opening 16 and fit tightly against these, so that on subsequent piston upstrokes in the pump chamber existing fuel is compressed and pressed out past a check valve 25 toward the accumulator tank 6 , in order to be injected into the cylinders of the combustion engine via this tank.
- these may each have a conduit to the accumulator tank or, as indicated in FIG. 1 , a joint conduit from the high pressure pump to the accumulator tank.
- the function of a pump element may be degraded mainly through two types of leakage.
- One is due to fuel leaking past the piston 15 , as indicated with the arrows 26 , since the piston does not seal tightly against the surrounding pump chamber walls. This may be due to wear particles having entered the fuel and damaged the walls.
- the other type of leakage is a leakage past the inlet valve 17 , from the pump chamber to the low pressure part 3 , when the piston 15 is in the fuel compression phase and the inlet valve must fully close the connecting opening 16 . This may be due to the valve being damaged, for example due to wear and tear.
- a device for functionality control of the high pressure pump 5 , comprises elements 27 configured and operable to measure the fuel pressure in a position in the low pressure part at the inlet to the high pressure pump.
- This pressure measurement element 27 is configured to send information about the measured fuel pressure to the control device 11 to control the feeding pump 2 , and to a device 28 arranged in the engine control device configured and operable to compare the pressure measured by the element 24 in the accumulator tank with a reference value for this, and, during the performance of the method according to the invention, to carry out this comparison in connection with a pressure reduction measured at one of the elements 27 .
- a method according to a first embodiment of the invention is designed to be carried out as described below with reference to the diagram in FIG. 3 , which shows development of the fuel pressure P over time t.
- the uppermost straight line P B represents a requested reference value for the fuel pressure in the accumulator tank during a given stationary operating mode of the combustion engine, and this may e.g. be 2 000 bar.
- the dashed line P min shows the fuel pressure in the position in the low pressure part, and at which the high pressure pump in normal functioning is incapable of delivering a fuel pressure in the accumulator tank which reaches the requested reference value, and this pressure may for example be 3 bar.
- P in shows the pressure measured by the element 27 at the inlet to the high pressure pump, which during normal operation in the stationary operating mode of the combustion engine could be 5 bar.
- the method according to the invention is started at the time t 0 , by the feeding pump being controlled to reduce the fuel pressure P in at the inlet to the high pressure pump.
- the pressure P s in the accumulator tank is measured and compared with the requested reference value P B .
- the pressure reduction continues until a predetermined difference value ⁇ is achieved between P B and P s , which may e.g. be 50 bar. This occurs at the time t 1 , and the pressure P in at this time is registered as a limit pressure P G .
- the limit pressure is substantially consistent with P min , then this indicates a good functionality of the high pressure pump. In the case displayed, however, the limit pressure is substantially higher than minimum pressure, namely around 3.5 bar, which indicates a reduced functionality of the high pressure pump and that a leak between the piston and the pump chamber wall in one or several pump elements probably exists.
- the time lapsed between t 0 and t 1 i.e. the time which is required to carry out the method according to the invention, may for example be around 500 ms.
- FIG. 4 shows the same type of diagram as FIG. 3 for the performance of the method according to the invention, according to another embodiment of the invention.
- the pressure P s in the accumulator tank does not fall below the requested reference value P B before P in reaches P min , and the feeding pump is therefore controlled to reduce the pressure in the inlet to the high pressure pump further by around 10%, and yet the pressure still does not fall in the accumulator tank, but rather increases somewhat. This indicates so-called self-pumping through inadequate sealing, due to damage of one or several inlet valves in the high pressure pump.
- FIG. 5 shows a flow chart which illustrates a method according to one embodiment of the invention, for functionality control of a high pressure pump in a system for fuel injection in a combustion engine.
- a first step S 1 is to determine whether a stationary operating mode prevails in the combustion engine. If it prevails, then in a second step S 2 , the fuel system's feeding pump 2 is controlled to reduce the pressure at the inlet to the high pressure pump 4 , and this step is carried out in parallel with step S 3 of measuring the pressure at the inlet, and measuring the pressure P s in the accumulator tank 6 at a step S 4 .
- step S 5 the pressure measured in the accumulator tank is compared with a reference value P B for this, in order to be used in a step S 6 for generating information about the high pressure pump's functionality.
- a computer program code for the implementation of a method according to the invention is suitably included in a computer program, loadable into the non-volatile internal memory of a computer, such as the internal memory of an electronic control device of a combustion engine.
- a computer program is suitably provided via a computer program product, comprising a non-volatile data storage medium readable by an electronic control device, which data storage medium has the computer program stored thereon.
- the data storage medium is e.g. an optical data storage medium in the form of a CD-ROM, a DVD, etc., a magnetic data storage medium in the form of a hard disk drive, a diskette, a cassette, etc., or a Flash memory or a ROM, PROM, EPROM or EEPROM type memory.
- FIG. 6 illustrates schematically an electronic control device 29 comprising execution means 30 , such as a central processor unit (CPU), for the execution of a computer software.
- execution means 30 communicates with a memory 31 , e.g. a RAM memory, via a data bus 32 .
- the control device 29 also comprises a data storage medium 33 , e.g. in the form of a Flash memory or a ROM, PROM, EPROM or EEPROM type memory.
- the execution means 30 communicates with the data storage means 33 via the data bus 32 .
- a computer program comprising computer program code for the implementation of a method according to the invention, for example in accordance with the embodiment illustrated in FIG. 4 , is stored on the data storage medium 33 .
- the appearance of the high pressure pump's pump element could be different than as illustrated schematically in FIG. 2 .
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
- The present application is a 35 U.S.C. §§371 national phase conversion of PCT/SE2014/050627, filed May 22, 2014, which claims priority of Swedish Patent Application No. 1350628-2, filed May 23, 2013, the contents of which are incorporated by reference herein. The PCT International Application was published in the English language.
- The present invention pertains to a method for function control of a high pressure pump in a system for fuel injection in a combustion engine. The system comprises an independent feeding pump, controllable by the combustion engine, for the supply of fuel in a low pressure part of the system to the high pressure pump. The latter comprises at least one pump element connected between the low pressure part and an accumulator tank for fuel injection to the combustion engine. The pump element has a cylinder with a pump chamber with a movable piston inside the chamber for purposes of pumping. In the connecting opening in this cylinder, there is an inlet valve to the low pressure part. The inlet valve is controllable for controlling the flow of fuel into the pump chamber. The invention also pertains to a device that performs the method.
- The invention is not limited to any specific type of combustion engine or fuel, and diesel and ethanol may be mentioned as a couple of nonexhaustive examples of fuel. Also, the invention pertains to function control of a high pressure pump for supply of fuel to combustion engines that are designed for all types of use, such as in industrial applications, crushing machines and in various types of motor vehicles. The invention is particularly applicable to wheeled motor vehicles, especially commercial vehicles, such as trucks and buses, and will for this reason sometimes be discussed in this application with the objective of elucidating, but not limiting, the invention.
- With respect to the low pressure part in a system for fuel injection in a combustion engine, the invention is applicable to systems in which the feeding pump is controllable independently of the combustion engine. This is advantageously achieved since the pump is driven by an electric engine, which may be controlled totally independently of the combustion engine's function. In other respects, the low pressure part of the system may have any appearance.
- In order to ensure a secure and efficient operation of a system, it is desirable to be able to discover impaired performance ability in the high pressure pump early, in order to be able to take suitable measures for the pump to function optimally again, or in order to replace the pump. Herein, limited performance ability of the high pressure pump may be due to the occurrence of a leak in one or several of the pump elements between the inlet valve and the pump chamber's connecting opening to the low pressure part, e.g. because of a somewhat damaged valve, or leakage between the piston and pump chamber wall because of wear particles getting caught in the fuel and damaging the wall.
- U.S. Pat. No. 7,431,018 describes a method for detecting faults in a high pressure pump by measuring the fuel pressure in the area of the accumulator tank and comparing this with reference values. This is done with the help of a pressure regulator and pressure fault sensor, and the method described therein consists of a relatively blunt instrument for function control of a high pressure pump, and is more focused on discovering larger faults in the function of the same.
- The objective of the present invention is to provide a method and a device of the type defined above, which are improved in at least some respect in relation to prior art methods and devices of this type, with respect to achieving a reliable function control of a said high pressure pump.
- The invention is thus based on the insight that in stationary operating conditions of the combustion engine, with a constantly requested reference value of the fuel pressure in the accumulator tank, the feeding pump may be controlled so that the fuel pressure in the low pressure part at the inlet to the high pressure pump is reduced. At the same time, the pressure in the accumulator tank is measured and compared to the requested reference value of the fuel pressure in the accumulator tank, in order to use the outcome of this comparison as an indication of the high pressure pump's functionality. It has been found that with such a method, the occurrence of both the above mentioned types of leakage, i.e. at the inlet valve and between the piston and the pump chamber wall, in the high pressure pump may be discovered.
- Thus, the function control only requires stationary operating conditions in the combustion engine for a brief period of time, in the range of one second, in order to be carried out. When the combustion engine is located in a wheeled motor vehicle, the method may for example be carried out with desired intervals, when the vehicle is driven on a substantially horizontal base at a substantially constant speed.
- According to one embodiment of the invention, the reduction of the fuel pressure at said position in the low pressure part is carried out toward a predetermined minimum pressure, at which the high pressure pump at normal functioning is incapable of delivering a fuel pressure in the accumulator tank which achieves the requested reference value, and the fuel pressure at the position in the low pressure part, at which the fuel pressure in the accumulator tank falls below the reference value, is registered as a limit pressure. By deciding the value of the limit pressure and its size in relation to the size of said minimum pressure, a measure of the high pressure pump's functionality may be obtained.
- According to one further development of this embodiment, the pressure reduction in step b) is made down to a pressure which is higher than or equal to the minimum pressure, and the fuel pressure in the low pressure part at which the comparison in step d) gives a measurable difference, is registered as the limit pressure and used to determine the pump's functionality. If, by carrying out this method, a limit pressure which is higher than the minimum pressure is confirmed, then the conclusion may be drawn that the high pressure pump functions inadequately in its compression phase, because of the occurrence of a leakage between the piston and the pump chamber wall in one or several pump elements.
- According to another embodiment of the invention, the pressure reduction is interrupted in the position, when the fuel pressure in the accumulator tank falls below the requested reference value by a predetermined difference value. This difference value may for example be 25-100 bar, 30-70 bar or around 50 bar, and when this occurs, the then prevailing pressure at the position may be determined as the limit pressure.
- According to another embodiment of the invention, in step b) the feeding pump is controlled, so that the fuel pressure at the position falls until it is below a minimum pressure by at least 5%, 5-20% or 5-10% when the high pressure pump is unable, during normal functioning, to deliver a fuel pressure in the accumulator tank in accordance with the requested reference value. By reducing the pressure in the position in the low pressure part down to this level, the occurrence of so-called self-pumping due to the occurrence of a leakage in one or several pump elements between the inlet valve and the pump chamber's connecting opening to the low pressure part may be discovered. Where such a noticeable leakage occurs, the fuel pressure in the accumulator tank will not fall below the reference value, even though the pressure is at or below the minimum pressure at the position.
- Accordingly, by reducing the pressure in the position of the low pressure part down toward the minimum pressure, the leakage between the piston and the pump chamber wall may be detected, but the limit value is not reached until the minimum pressure has been reached, or if it has not been reached, the pressure may be reduced a little to determine whether the high pressure pump has optimal functionality (the pressure in the accumulator tank should then fall) or whether one of the inlet valves is damaged (the pressure in the accumulator tank in that case does not fall).
- According to another embodiment of the invention, the method for a high pressure pump is carried out with several of the pump elements connected in parallel between the low pressure part of the system and the accumulator tank, and in the stationary operating mode of the combustion engine, at which a single pump element is capable of delivering a fuel pressure in the accumulator tank according to the requested reference value alone, and steps a)-d) are carried out during the control of the high pressure pump's elements, so that the single pump element delivers the fuel pressure requested in the accumulator tank in order to determine the functionality of such pump element. By carrying out the method according to the invention in a stationary operating mode, which only requires the use of one pump element, a reliable functionality control of such specific pump element may be carried out. It is pointed out that the minimum pressure will thus be higher than in the event the functionality control is carried out in an operating mode with several pump elements operating simultaneously.
- According to a further development of this embodiment, the steps a)-d) are carried out at intervals for all the pump elements during the control of the high pressure pump's pump elements, so that a single one of the high pressure pump's pump elements delivers a fuel pressure in the accumulator tank alone, according to the requested reference value for the determination of the functionality of all the pump elements. This embodiment thus facilitates the identification of a failing pump element, or a pump element with poorer functionality than normal.
- According to another embodiment of the invention, the method comprises storage of data produced during the performance of the method steps, in order to provide the possibility of later assessment of the functionality of the high pressure pump or the high pressure pump and its pump elements. Thus, during maintenance of the high pressure pump, the parts of the latter which so require it, may be appropriately addressed.
- The invention also provides a device according to the invention equipped with the features disclosed herein.
- Other advantageous features and advantages with the invention are set out in the description below.
- Below are descriptions of example embodiments of the invention with reference to the enclosed drawings, in which:
-
FIG. 1 is a schematic view illustrating the structure of a system for fuel supply to a combustion engine, comprising a device according an embodiment of the invention for the performance of a method according to the invention, -
FIG. 2 is a simplified view, illustrating the structure and function of a pump element in a high pressure pump in a system according toFIG. 1 , -
FIG. 3 and -
FIG. 4 are diagrams showing the pressure in the accumulator tank, and in the position in the low pressure part over time, at the performance of the method according to the invention according to two different embodiments, -
FIG. 5 is a flow chart showing a method according to one embodiment of the invention, and -
FIG. 6 is a diagram of an electronic control device for the implementation of a method according to the invention. -
FIG. 1 shows a system for fuel injection in a combustion engine equipped with a device according to the invention, and on which methods according to the invention described below are applicable. The general structure of the system is prior art and comprises afuel tank 1, which is here divided into two containers, from which fuel, via afeeding pump 2 in alow pressure part 3 with a pressure of for example 2-6 bar, is fed to ahigh pressure part 4 of the system, which starts with a high pressure pump 5, which pumps fuel at a high pressure, for example in the range of 500-2 500 bar, pumps fuel to anaccumulator tank 6 with nozzles 7 for injection of fuel into the cylinders of the combustion engine 8, which is here arranged in a motor vehicle identified with thedigit 9. The components which are drawn inside the frame M are here arranged on the combustion engine. - The
feeding pump 2 is operated by anelectric engine 10, which is controlled by acontrol device 11 and is thus controllable independently of the combustion engine. - Reference is now made to
FIG. 2 , with the help of which the structure and function of the high pressure pump 5 will be described in further detail. The high pressure pump comprises one or several pump elements, usually 2-3 pump elements, but the number is arbitrary and may be for example 8, and the pump elements are connected in parallel between thelow pressure part 3 of the system and theaccumulator tank 6 for fuel injection to the combustion engine.FIG. 2 shows only one of these pump elements 12, but they all have the same design and are controlled in the same manner, and in the event there are several such elements, they each have a cylinder 13 with apump chamber 14, with amoveable piston 15 for pumping therein, and aninlet valve 17 in the cylinder's connecting opening 16 to the low pressure part, which valve is controllable via anactuator 18 in order to control the flow of fuel into and/or out of thepump chamber 14. Specifically, the pumping of fuel is effected via a pump element 12, through alifter 19 connected with thepiston 15 being impacted by acamshaft 20, which is mechanically connected to the combustion engine'scrankshaft 21, so that thepiston 15 will move forwards and backwards in thepump chamber 14 in accordance with the rotation of theengine crankshaft 21. Theactuator 18 of theinlet valve 17 is controlled through control signals from amotor control device 22, which in its turn obtains information regarding the engine crankshaft's or the camshaft's instantaneous position, and thus the position of thepiston 15, via theengine position sensors 23. Theengine control device 22 also obtains information from anelement 24 designed to measure the fuel pressure in theaccumulator tank 6. - Generally this means that when the
piston 15 moves inFIG. 2 , seen in the downwards direction, and the pump chamber volume increases, theactuator 18 controls theinlet valve 17 so that it moves in the same direction, so that fuel may pass through thevalve 17 in the connectingopening 16 and be sucked into thepump chamber 14. When thepiston 15 then is in the region of its lowest position with maximum pump chamber volume, theactuator 18 controls theinlet valve 17, so that it moves upwards to abut against the walls defined in the connectingopening 16 and fit tightly against these, so that on subsequent piston upstrokes in the pump chamber existing fuel is compressed and pressed out past acheck valve 25 toward theaccumulator tank 6, in order to be injected into the cylinders of the combustion engine via this tank. Thus, if there are several pump elements, these may each have a conduit to the accumulator tank or, as indicated inFIG. 1 , a joint conduit from the high pressure pump to the accumulator tank. - The function of a pump element may be degraded mainly through two types of leakage. One is due to fuel leaking past the
piston 15, as indicated with thearrows 26, since the piston does not seal tightly against the surrounding pump chamber walls. This may be due to wear particles having entered the fuel and damaged the walls. The other type of leakage is a leakage past theinlet valve 17, from the pump chamber to thelow pressure part 3, when thepiston 15 is in the fuel compression phase and the inlet valve must fully close the connectingopening 16. This may be due to the valve being damaged, for example due to wear and tear. - There follows a description of characterising features of the present invention. For functionality control of the high pressure pump 5, a device according to the invention comprises
elements 27 configured and operable to measure the fuel pressure in a position in the low pressure part at the inlet to the high pressure pump. Thispressure measurement element 27 is configured to send information about the measured fuel pressure to thecontrol device 11 to control thefeeding pump 2, and to adevice 28 arranged in the engine control device configured and operable to compare the pressure measured by theelement 24 in the accumulator tank with a reference value for this, and, during the performance of the method according to the invention, to carry out this comparison in connection with a pressure reduction measured at one of theelements 27. - A method according to a first embodiment of the invention is designed to be carried out as described below with reference to the diagram in
FIG. 3 , which shows development of the fuel pressure P over time t. Thus, the uppermost straight line PB represents a requested reference value for the fuel pressure in the accumulator tank during a given stationary operating mode of the combustion engine, and this may e.g. be 2 000 bar. The dashed line Pmin shows the fuel pressure in the position in the low pressure part, and at which the high pressure pump in normal functioning is incapable of delivering a fuel pressure in the accumulator tank which reaches the requested reference value, and this pressure may for example be 3 bar. Pin shows the pressure measured by theelement 27 at the inlet to the high pressure pump, which during normal operation in the stationary operating mode of the combustion engine could be 5 bar. The method according to the invention is started at the time t0, by the feeding pump being controlled to reduce the fuel pressure Pin at the inlet to the high pressure pump. During this pressure reduction the pressure Ps in the accumulator tank is measured and compared with the requested reference value PB. The pressure reduction continues until a predetermined difference value Δ is achieved between PB and Ps, which may e.g. be 50 bar. This occurs at the time t1, and the pressure Pin at this time is registered as a limit pressure PG. If this limit pressure is substantially consistent with Pmin, then this indicates a good functionality of the high pressure pump. In the case displayed, however, the limit pressure is substantially higher than minimum pressure, namely around 3.5 bar, which indicates a reduced functionality of the high pressure pump and that a leak between the piston and the pump chamber wall in one or several pump elements probably exists. The time lapsed between t0 and t1, i.e. the time which is required to carry out the method according to the invention, may for example be around 500 ms. -
FIG. 4 shows the same type of diagram asFIG. 3 for the performance of the method according to the invention, according to another embodiment of the invention. In this case, the pressure Ps in the accumulator tank does not fall below the requested reference value PB before Pin reaches Pmin, and the feeding pump is therefore controlled to reduce the pressure in the inlet to the high pressure pump further by around 10%, and yet the pressure still does not fall in the accumulator tank, but rather increases somewhat. This indicates so-called self-pumping through inadequate sealing, due to damage of one or several inlet valves in the high pressure pump. -
FIG. 5 shows a flow chart which illustrates a method according to one embodiment of the invention, for functionality control of a high pressure pump in a system for fuel injection in a combustion engine. A first step S1 is to determine whether a stationary operating mode prevails in the combustion engine. If it prevails, then in a second step S2, the fuel system'sfeeding pump 2 is controlled to reduce the pressure at the inlet to thehigh pressure pump 4, and this step is carried out in parallel with step S3 of measuring the pressure at the inlet, and measuring the pressure Ps in theaccumulator tank 6 at a step S4. In step S5 the pressure measured in the accumulator tank is compared with a reference value PB for this, in order to be used in a step S6 for generating information about the high pressure pump's functionality. - A computer program code for the implementation of a method according to the invention is suitably included in a computer program, loadable into the non-volatile internal memory of a computer, such as the internal memory of an electronic control device of a combustion engine. Such a computer program is suitably provided via a computer program product, comprising a non-volatile data storage medium readable by an electronic control device, which data storage medium has the computer program stored thereon. The data storage medium is e.g. an optical data storage medium in the form of a CD-ROM, a DVD, etc., a magnetic data storage medium in the form of a hard disk drive, a diskette, a cassette, etc., or a Flash memory or a ROM, PROM, EPROM or EEPROM type memory.
-
FIG. 6 illustrates schematically anelectronic control device 29 comprising execution means 30, such as a central processor unit (CPU), for the execution of a computer software. The execution means 30 communicates with amemory 31, e.g. a RAM memory, via adata bus 32. Thecontrol device 29 also comprises adata storage medium 33, e.g. in the form of a Flash memory or a ROM, PROM, EPROM or EEPROM type memory. The execution means 30 communicates with the data storage means 33 via thedata bus 32. A computer program, comprising computer program code for the implementation of a method according to the invention, for example in accordance with the embodiment illustrated inFIG. 4 , is stored on thedata storage medium 33. - The invention is obviously not limited in any way to the embodiments described above, but numerous possible modifications thereof should be obvious to a person skilled in the area, without such person departing from the spirit of the invention as defined by the appended claims.
- The appearance of the high pressure pump's pump element could be different than as illustrated schematically in
FIG. 2 . - Is respect of the fuel, it would be fully possible to carry out the method on a combustion engine which is operated with a fuel which is gaseous at the pressure prevailing in the low pressure part, but which becomes liquid in the high pressure part, such as for example DME (dimethyl).
- The methods could very well be carried out in the form of workshops tests. This also applies where the combustion engine is arranged in a motor vehicle.
Claims (17)
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SE1350628 | 2013-05-23 | ||
SE1350628A SE537251C2 (en) | 2013-05-23 | 2013-05-23 | Method and apparatus for functional control of a high-pressure fuel pump |
SE1350628-2 | 2013-05-23 | ||
PCT/SE2014/050627 WO2014189458A1 (en) | 2013-05-23 | 2014-05-22 | Method and device for functional control of a high pressure fuel pump |
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US20160108846A1 true US20160108846A1 (en) | 2016-04-21 |
US9518527B2 US9518527B2 (en) | 2016-12-13 |
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US14/892,074 Active US9518527B2 (en) | 2013-05-23 | 2014-05-22 | Method and device for functional control of a high pressure fuel pump |
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US (1) | US9518527B2 (en) |
EP (1) | EP2999878B1 (en) |
KR (1) | KR101783402B1 (en) |
BR (1) | BR112015027335A8 (en) |
SE (1) | SE537251C2 (en) |
WO (1) | WO2014189458A1 (en) |
Cited By (1)
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RU2676905C2 (en) * | 2014-03-31 | 2019-01-11 | Форд Глобал Текнолоджиз, Ллк | Method of controlling operation of high-pressure fuel pump (versions) and fuel system |
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GB2549140A (en) * | 2016-04-08 | 2017-10-11 | Delphi Int Operations Luxembourg Sarl | Fuel injection equipment and control method |
US10526994B2 (en) | 2017-01-30 | 2020-01-07 | Transportation Ip Holdings, Llc | Methods and system for diagnosing a high-pressure fuel pump in a fuel system |
US11668262B2 (en) | 2017-01-30 | 2023-06-06 | Transportation Ip Holdings, Llc | Methods and system for diagnosing a high-pressure fuel pump in a fuel system |
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2013
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- 2014-05-22 WO PCT/SE2014/050627 patent/WO2014189458A1/en active Application Filing
- 2014-05-22 BR BR112015027335A patent/BR112015027335A8/en not_active Application Discontinuation
- 2014-05-22 US US14/892,074 patent/US9518527B2/en active Active
- 2014-05-22 KR KR1020157036479A patent/KR101783402B1/en active IP Right Grant
- 2014-05-22 EP EP14800605.9A patent/EP2999878B1/en active Active
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EP2999878A4 (en) | 2017-02-08 |
BR112015027335A8 (en) | 2021-09-14 |
BR112015027335A2 (en) | 2017-07-25 |
KR20160011669A (en) | 2016-02-01 |
EP2999878A1 (en) | 2016-03-30 |
WO2014189458A1 (en) | 2014-11-27 |
KR101783402B1 (en) | 2017-09-29 |
US9518527B2 (en) | 2016-12-13 |
SE1350628A1 (en) | 2014-11-24 |
EP2999878B1 (en) | 2018-12-26 |
SE537251C2 (en) | 2015-03-17 |
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